A4: TURKEY CURUK DAG SITE: Photos at 0 m

This page authored by Steve Kershaw


Photos on this page show the latest Permian erosion surface at Çürük Dag; the extinction event took place above the erosion surface, but below the overlying grainstones, so that rock (and time) is missing here.


The latest Permian limestone is wackestone, so there is no empty space between grains to reveal any evidence of vadose cements needed to recognise whether or not this surface was exposed above sea level. The surface is very smooth, not consistent with sea-floor dissolution, so the process of ocean acidification, proposed by several authors for the end-Permian event, has no physical evidence here.

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Photo: Steve Kershaw

Photo: Steve Kershaw

Photo: Steve Kershaw

Photo: Steve Kershaw

Photo: Steve Kershaw

Three photos below show the Late Permian erosion surface, overlain by post-extinction grainstones.

Two photos below show details of the post-extinction grainstones. Some authors have described such deposits as post-extinction oolites, but in this case it is not a simple oolite, since only a few grains are ooids.

    Commonly centres of grains are composed of crystal fragments, and may indicate a pre-existing deposit of crystal fans that was destroyed by high energy of shallow waters in which these grains were deposited. Note also peloids and some well-preserved fossils.

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